I would not call it a small dial, this is the standard 2&3/4". Much earlier clocks(1880-early 1900s can come with with 2&1/4").
It only has stamp marks for the thread holes for a suspension guard attachment. This clock would have been supplied without.
It is an enamel dial, soap and water is fine, but you can be a little bit more aggressive, but it will still be difficult to hide the cracks.
Did you source it in India or elsewhere? It is surprising where these clocks turn up.